diff --git a/scripts/subagent_delivery_watchdog.mjs b/scripts/subagent_delivery_watchdog.mjs
index 5818590..03f79ba 100755
--- a/scripts/subagent_delivery_watchdog.mjs
+++ b/scripts/subagent_delivery_watchdog.mjs
@@ -48,9 +48,7 @@ function printHelp() {
     '',
     'Minimal CLI skeleton for the subagent delivery watchdog.',
   ];
-  process.stdout.write(`${lines.join('
-')}
-`);
+  process.stdout.write(`${lines.join('\n')}\n`);
 }
 
 function tryReadInput(inputPath) {
@@ -116,8 +114,7 @@ function writeDispatchReceiptState(payload) {
     expectedBy,
   };
 
-  fs.writeFileSync(statePath, `${JSON.stringify(dispatchRecord, null, 2)}
-`, 'utf8');
+  fs.writeFileSync(statePath, `${JSON.stringify(dispatchRecord, null, 2)}\n`, 'utf8');
 
   return {
     statePath,
@@ -160,8 +157,7 @@ function main() {
   };
 
   const spacing = args.compact ? 0 : 2;
-  process.stdout.write(`${JSON.stringify(response, null, spacing)}
-`);
+  process.stdout.write(`${JSON.stringify(response, null, spacing)}\n`);
 }
 
 main();
diff --git a/state/subagent-delivery-watchdog/fixture-run-active-before-sla.json b/state/subagent-delivery-watchdog/fixture-run-active-before-sla.json
new file mode 100644
index 0000000..8dabb54
--- /dev/null
+++ b/state/subagent-delivery-watchdog/fixture-run-active-before-sla.json
@@ -0,0 +1,6 @@
+{
+  "runId": "fixture-run-active-before-sla",
+  "childSessionKey": "session:active-before-sla",
+  "dispatchAt": "2026-04-24T10:00:00.000Z",
+  "expectedBy": "2026-04-24T10:10:00.000Z"
+}
diff --git a/state/subagent-delivery-watchdog/fixture-run-completed.json b/state/subagent-delivery-watchdog/fixture-run-completed.json
new file mode 100644
index 0000000..3436859
--- /dev/null
+++ b/state/subagent-delivery-watchdog/fixture-run-completed.json
@@ -0,0 +1,6 @@
+{
+  "runId": "fixture-run-completed",
+  "childSessionKey": "session:completed",
+  "dispatchAt": "2026-04-24T10:00:00.000Z",
+  "expectedBy": "2026-04-24T10:10:00.000Z"
+}
diff --git a/state/subagent-delivery-watchdog/fixture-run-suspect-delivery-failure.json b/state/subagent-delivery-watchdog/fixture-run-suspect-delivery-failure.json
new file mode 100644
index 0000000..81fa4c7
--- /dev/null
+++ b/state/subagent-delivery-watchdog/fixture-run-suspect-delivery-failure.json
@@ -0,0 +1,6 @@
+{
+  "runId": "fixture-run-suspect-delivery-failure",
+  "childSessionKey": "session:suspect-delivery-failure",
+  "dispatchAt": "2026-04-24T10:00:00.000Z",
+  "expectedBy": "2026-04-24T10:10:00.000Z"
+}